Guildline's 6645Q Quantum Hall System has been designed and developed to meet the needs of Standards Laboratories around the world for an improved level of accuracy in the calibration and maintenance of primary resistance standards.


  • Complete Turn Key System – Fully Integrated and Ready To use!
  • Featuring NEW Patented 6640Q-QHR Bridge!
  • Best Accuracy: ± 0.015 ppm of Reading at QHR Currents of 30 μA - 100 μA with Interchange!
  • Fasted Measurement Speed of 2 Seconds!
  • Built in Nano-Voltmeter for Hall Resistances and Longitudinal Resistances!
  • Pre-Cool with Nitrogen For Cost Savings!
  • 4 to 6 Day Uninterrupted QHR Operation!
  • Option for Magnetic Field Strength Up To 14 Tesla!
  • Premium QHR Sample Included, Built by NMI with 20 Years’ Experience
  • Change All Key Parameters “On-the-Fly” While the Measurement is Running!
  • BridgeWorksTM Data Acquisition Software!